package com.hmdp.service.impl;


import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {




    //redis
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    /**
     *  发送短信验证码并保存验证码
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.返回错误信息
            return Result.fail("手机号格式错误!");
        }
        //3.符合，生成一个验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码数据库
//        session.setAttribute("code",code);
        //4.保存验证码到redis中设置时间，设置存在时间
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
         log.debug("发送短信验证码成功，验证码：{}",code);
        //返回ok
        return Result.ok();
    }

    /**
     * 登录功能
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        String phone= loginForm.getPhone();
       //1.校验手机号
        if (RegexUtils.isPhoneInvalid(loginForm.getPhone())){
            //返回错误信息
            return Result.fail("手机号格式错误!");
        }


        //2.校验验证码
//        if (session.getAttribute("code")==null||!loginForm.getCode().equals(session.getAttribute("code"))){
//            //3.返回错误信息
//            return Result.fail("验证码错误!");
//        }
        //2.从redis获取验证码进行校验
        String cacheCode=stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if (cacheCode==null||!code.equals(cacheCode)){
            //3.返回错误信息
            return Result.fail("验证码错误!");
        }

        //4.一致，根据手机号查询用户 select * from tb_user where phone =?
        User user = query().eq("phone", phone).one();

        //5.判断用户是否存在
        if (user==null){
            //6.不存在，创建新用户并保存
            user =createUserWithPhone(phone);
        }

        //7.保存用户信息到session中
//        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //7.保存用户信息到redis中

        //7.1.随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //7.2.将user对象转为hashmap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //7.3存储
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        //7.4.设置token的过期时间
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    /**
     * 签到
     * @return
     */
    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key]
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyy-MM-dd"));
        String key=USER_SIGN_KEY+userId+keySuffix;
        //4.判断今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //4.写入redis，setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    /**
     * 签到统计
     * @return
     */
    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key]
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyy-MM-dd"));
        String key=USER_SIGN_KEY+userId+keySuffix;
        //4.判断今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截止今天为止的所有的签到记录，返回一个十进制数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key, BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null|| num == 0){
            return Result.ok(0);
        }
        //6.循环遍历
        int count=0;
        while (true) {
            //7.让这个数字与1做与运算，得到数字的最后的一个bit位//判断这个bit位是否为0
            if ((num& 1) == 0){
                //如果为0，说明未签到，结束
                break;
            }else {
                //如果为1，说明已签到，计数器+1
               count++;
            }
            //把数字右移一位，抛弃最后一个bit位
         num>>>=1;
        }
        return Result.ok(count);
    }

    /**
     * 根据手机号创建用户
     * @param phone
     * @return
     */
    private User createUserWithPhone(String phone) {
          User user = new User();
        user.setPhone(phone);
         user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
         //保存用户
        save(user);
        return user;
    }
}
